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Write-Ahead Logging
Both in-memory storage engine and disk storage engine use write-ahead logging. The transaction result returns only after it has been saved to disk. This means that even a sudden server restart wouldn’t cause data loss.
Synchronous Replication
When a disk or a server fails, replication helps prevent data loss. In Tarantool, replication lag is typically 100-200 µs, which is equal to network latency and reduces the probability of data loss to virtually zero. When you need guaranteed data persistence, you can configure synchronous replication only for critical data in the tables you need.
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